Reasons affecting the flame resistance of non-woven fabrics

Update:06 Mar 2020
Summary:

(1) The oxygen limit index of conventional polyester co […]

(1) The oxygen limit index of conventional polyester cotton is 20-22 (the oxygen concentration in the air is 21%), which is a type of combustible fiber. It is easy to ignite but has a slower burning rate.
(2) If the polyester slice is modified and denatured, it will have a flame retardant effect. Most of the long-acting flame-retardant fibers use denatured polyester chips to produce flame-retardant polyester cotton. The main modifier is a phosphorus compound. The use of phosphorus in high heat will combine with oxygen in the air to reduce the oxygen content. Flame retardant effect.
(3) Another method for making polyester cotton flame retardant is surface treatment. This kind of product is thought that the treatment agent will reduce the flame retardant effect after repeated processing.
(4) Polyester cotton has the characteristics of shrinking when exposed to high heat. When the fiber shrinks when it encounters a flame, it is not easy to ignite due to the shrinkage, and it has an appropriate flame retardant effect.
(5) Polyester cotton will melt and sag when exposed to high heat. The melting and dripping phenomenon of polyester cotton after ignition can also take away some of the
Heat and flame to produce a proper flame retardant effect.
(6) However, if the fiber is stained with oil that is easy to support combustion or the use of silicone oil that can shape polyester cotton, polyester cotton will reduce the flame retardant effect. In particular, when polyester cotton containing SILICONE oil is exposed to flames, the fibers cannot shrink and burn.
(7) A method for increasing the flame retardancy of polyester cotton. In addition to producing polyester cotton by using flame-retardant modified polyester chips, the use of an oil agent with a higher phosphate content as a post-treatment on the fiber surface can also increase the flame retardancy of the fiber. . Because the phosphate molecules released by the high-temperature phosphate will combine with the oxygen molecules in the air and reduce the oxygen content in the air to achieve the property of increasing flame retardancy.